To do:
- consider changing the UNIX domain socket interface between Xsupplicant and
  wpa_supplicant to use more secure mechanism(?)
- add WPA support to Linux Wireless Extensions
- add support for other drivers
- port for *BSD
- wpa_supplicant.c: extend UNIX domain socket interface to provide mechanism
  for adding wpa_supplicant frontends
- implement GUI for WPA Supplicant/Xsupplicant/iwconfig/iwlist
  (easy to use configuration and network stats, etc.)
- add support for IEEE 802.11i/D7.0
